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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca2013e132a70fb632661b18f047fd5c43a5092dc0a814856f695c1a672803f' 
  AND token = '2wThLDh5MX7Vr/jOcrY/QQLa41bzcqieEqO8nRxMeKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}